Computers do not recognize my WD My Book Essential

@Joe - First, we plug My Book to usb 3.0 and its not working. We unplugged it and plug to usb 2.0 port 

Note: My Book Essential usb 3.0 + usb 2.0 <–100% compatible. It says Ultra fast Performance with usb 3.0. Yes, its an external hard drive but it will only shows either My Book or My Passport